A work holding device consisting of a longitudinally slotted sleeve which has a tapering or conical end designed to fit into a corresponding taper of a chuck so that the lengthwise movement of the sleeve causes a contraction or expansion of the gripping surfaces. The gripping or holding tension is actuated by a backward pull (draw in) or by a forward push (force in). Used on lathes, milling machines, screw machines and the like. Excludes SOCKET, STRAIGHT SHANK TOOL and SOCKET, TAPER SHANK TOOL.